Well, since I have that MSI board in my personal system, I can attest to its quality. The only minor complaint I have is that the Sata ports can be a little difficult to reach depending on the size of the case. However, it's not a big deal to me as you don't spend a lot of type plugging and unplugging sata devices.
The one benefit to the ASUS I can see is that it has 4 USB 3.0 ports and 2 USB 2.0 ports in the back whereas the MSI has 2 3.0 ports and 4 2.0 ports. That's a pretty insignificant difference though, IMO since there aren't many devices that benefit from 3.0 aside from external harddrives and devices you are charging from the USB port.
As phil stated though both manufacturers make quality products and I don't think you'll be disappointed with either one, unless you're one of the unlucky ones that gets a defective product. Not much you can do about that.
Edited by kidnova, 10 August 2012 - 02:05 PM.